<template>
  <div>
    <!-- 面包屑 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert
        title="添加商品信息"
        type="info"
        show-icon
        center
        :closable="false"
      >
      </el-alert>
      <!-- 步骤条 -->
      <el-steps
        :space="300"
        :active="activeIndex - 0"
        finish-status="success"
        align-center
      >
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- TAB -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        label-position="top"
      >
        <el-tabs
          tab-position="left"
          :before-leave="beforeTabLeave"
          v-model="activeIndex"
          @tab-click="tabClicked"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <!-- 级联选择框 -->
              <el-cascader
                expand-trigger="hover"
                v-model="addForm.goods_cat"
                :options="catelist"
                :props="cateProps"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染的item项 -->
            <el-form-item
              :label="item.attr_name"
              v-for="item in manyTableData"
              :key="item.attr_id"
            >
              <!-- 复选框 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox
                  :label="cd"
                  v-for="(cd, i) in item.attr_vals"
                  :key="i"
                  border
                ></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item
              :label="item.attr_name"
              v-for="item in onlyTableData"
              :key="item.attr_id"
            >
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action表示图片要上传到的后台API地址 -->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess"
            >
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品按钮 -->
            <el-button type="primary" class="ebtn" @click="add"
              >添加商品</el-button
            >
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="60%">
      <img :src="previewPath" alt="" class="previewImg" />
    </el-dialog>
  </div>
</template>

<script>
import _ from "lodash";
export default {
  name: "add",
  data() {
    return {
      //各个项赋值name属性
      // 点击列表中的各个项 双向绑定到activeIndex 再与步骤条中的项进行双向绑定
      activeIndex: "0",
      addForm: {
        goods_name: "",
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组 里面是ID
        goods_cat: [],
        // 图片的数组
        pics: [],
        // 商品的详细描述
        goods_introduce: "",
        // 商品的参数（数组），包含 `动态参数` 和 `静态属性`
        attrs: [],
      },
      //   校验规则
      addFormRules: {
        goods_name: [
          { required: true, message: "请输入商品名称", trigger: "blur" },
        ],
        goods_price: [
          { required: true, message: "请输入商品价格", trigger: "blur" },
        ],
        goods_weight: [
          { required: true, message: "请输入商品重量", trigger: "blur" },
        ],
        goods_number: [
          { required: true, message: "请输入商品数量", trigger: "blur" },
        ],
        goods_cat: [
          { required: true, message: "请选择商品分类", trigger: "blur" },
        ],
      },
      //   所有分类数据
      catelist: [],
      //   级联选择器配置对象
      cateProps: {
        // 看到的值
        label: "cat_name",
        // 选中的是谁的值
        value: "cat_id",
        // 谁实现父子节点的嵌套
        children: "children",
      },
      // 动态参数列表数据
      manyTableData: [],
      // 静态属性数据
      onlyTableData: [],
      // 上传图片的URL地址
      uploadURL: "http://127.0.0.1:8888/api/private/v1/upload",
      // 图片上传组件的headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem("token"),
      },
      // 预览效果
      previewPath: "",
      // 预览图片显示
      previewVisible: false,
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200) {
        return this.$message.erroe("请求失败");
      }
      this.catelist = res.data;
      // console.log(this.catelist);
    },
    // 级联选择器选中项变化,会触发的函数
    handleChange() {
      console.log(this.addForm.goods_cat);
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat.length = [];
      }
    },

    beforeTabLeave(activeName, oldActiveName) {
      if (oldActiveName === "0" && this.addForm.goods_cat.length !== 3) {
        this.$message.error("请选择三级参数");
        console.log(this.addForm.goods_cat);
        return false;
      }
    },
    // tab 被选中时触发
    async tabClicked() {
      // 证明访问的是动态参数面板 请求动态参数模块数据
      if (this.activeIndex === "1") {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: "many" },
          }
        );
        if (res.meta.status !== 200) {
          return this.$message.error("请求参数失败");
        }
        // console.log(res.data);
        // 将attr_vals的字符串分割为数组
        res.data.forEach((item) => {
          item.attr_vals =
            item.attr_vals.length === 0 ? [] : item.attr_vals.split(" ");
        });
        this.manyTableData = res.data;
      } else if (this.activeIndex === "2") {
        // 请求商品静态属性模块数据
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: "only" },
          }
        );
        if (res.meta.status !== 200) {
          return this.$message.error("请求静态属性失败");
        }
        console.log(res.data);
        this.onlyTableData = res.data;
      }
    },
    // 处理图片预览效果
    handlePreview(file) {
      this.previewPath = file.response.data.url;
      this.previewVisible = true;
    },
    // 点击图片叉号 移除图片的操作
    handleRemove(file) {
      // 1.获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path;
      // 2.从pics数组中,找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex((x) => x.pic === filePath);
      // 3.调用splice方法删除
      this.addForm.pics.splice(i, 1);
    },
    // 监听图片上传成功时的事件
    handleSuccess(response) {
      console.log(response);
      // 拼接到到一个图片的信息对象
      const picInfo = { pic: response.data.tmp_path };
      // 将图片信息对象push到pics中
      this.addForm.pics.push(picInfo);
      console.log();
    },
    async add() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) {
          // 表单预校验
          return this.$message.error("请填写必要的表单项");
        }
        // 校验通过,进行添加请求
        // 对this.addForm进行深拷贝
        // 因为保存级联选择器的goods_cat为数组,而发送请求时goods_cat必须为字符串
        // 避免冲突所以深拷贝this.addForm.一份级联选择器用,一份发送请求用.
        const form = _.cloneDeep(this.addForm);
        form.goods_cat = form.goods_cat.join(",");
        console.log(form);
        // 处理动态参数;
        this.manyTableData.forEach((item) => {
          const newInfo = {
            attr_id: items.attr_id,
            attr_value: item.attr_vals.join(" "),
          };
          this.addForm.attrs.push(newInfo);
        });
        // 处理动态属性;
        this.onlyTableData.forEach((item) => {
          const newInfo = {
            attr_id: items.attr_id,
            attr_value: item.attr_vals.join(" "),
          };
          this.addForm.attrs.push(newInfo);
        });

        // 将addForm的attrs赋值给 form
        form.attrs = this.addForm.attrs;
        const { data: res } = await this.$http.post("goods", form);
        if (res.meta.status !== 201) {
          return this.$message.error("添加商品失败");
        }
        this.$message.success("添加商品成功");
        // 添加成功后页面跳转到商品列表
        this.$router.push("/goods");
      });
    },
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2];
      }
      return null;
    },
  },
};
</script>

<style lang='less' scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.previewImg {
  width: 100%;
}
.ebtn {
  margin-top: 20px;
}
</style>